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135 pages first pub 1988 (editions)

nonfiction education mathematics science informative medium-paced
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208 pages first pub 1988 (editions)

nonfiction education mathematics science informative medium-paced

208 pages first pub 1988 (editions)

nonfiction education mathematics science informative medium-paced

180 pages first pub 1988 (editions)

nonfiction education mathematics science informative medium-paced

135 pages first pub 1988 (editions)

nonfiction education mathematics science informative medium-paced

144 pages first pub 1988 (editions)

nonfiction education mathematics science informative medium-paced

160 pages missing pub info (editions)

nonfiction education mathematics science informative medium-paced
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